People like it when fiction abilities can have a logical explanation, even if they are still impossible. The harder the material, harder to shape. But that's not the case with metals, because they can be heated into liquid form and then shaped into whatever you want. But if you heat diamond it will just burn, because it is basically a carbon.

Also going back to steel vs diamond, steel can't cut it but steel get's heated under pressure and friction, tho not to the point of diamond's burning temperature which is 800C. Another weakness of diamond is that it reacts with other materials easier than steel. So Oda has some stuff to use in the battle.

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